diff --git a/data/progress.txt b/data/progress.txt
index d6b1f8b1..8f66dc17 100644
--- a/data/progress.txt
+++ b/data/progress.txt
@@ -1,4 +1,4 @@
-20240310: 213,217,226,230,235,238,242
+20240310: 213,217,226,230,235,238,242,252
 20240309: 207(again!!!),208,211(again),212
 20240308: 152,153(again),190,191,198,200,206(again)
 20240307: 139(again),141,143(again)
diff --git a/data/to_review.txt b/data/to_review.txt
index f3531518..b8b3c5ee 100644
--- a/data/to_review.txt
+++ b/data/to_review.txt
@@ -1,4 +1,4 @@
-2024-05-04 -> ['213,217,226,230,235,238,242']
+2024-05-04 -> ['213,217,226,230,235,238,242,252']
 2024-05-03 -> ['207(again!!!),208,211(again),212']
 2024-05-02 -> ['152,153(again),190,191,198,200,206(again)']
 2024-05-01 -> ['139(again),141,143(again)']
@@ -9,7 +9,7 @@
 2024-04-24 -> ['39,48(again),49,53,54']
 2024-04-23 -> ['20,21,23,33(again)']
 2024-04-22 -> ['1,3,5,4,19']
-2024-04-13 -> ['213,217,226,230,235,238,242']
+2024-04-13 -> ['213,217,226,230,235,238,242,252']
 2024-04-12 -> ['207(again!!!),208,211(again),212']
 2024-04-11 -> ['152,153(again),190,191,198,200,206(again)']
 2024-04-10 -> ['139(again),141,143(again)']
@@ -20,7 +20,7 @@
 2024-04-03 -> ['39,48(again),49,53,54']
 2024-04-02 -> ['20,21,23,33(again)']
 2024-04-01 -> ['1,3,5,4,19']
-2024-03-31 -> ['213,217,226,230,235,238,242']
+2024-03-31 -> ['213,217,226,230,235,238,242,252']
 2024-03-30 -> ['207(again!!!),208,211(again),212']
 2024-03-29 -> ['152,153(again),190,191,198,200,206(again)']
 2024-03-28 -> ['139(again),141,143(again)']
@@ -28,19 +28,19 @@
 2024-03-26 -> ['100,102,104,105(again)']
 2024-03-25 -> ['73,76,79(again),91,25']
 2024-03-24 -> ['55(again),56,62,70']
-2024-03-23 -> ['213,217,226,230,235,238,242']
+2024-03-23 -> ['213,217,226,230,235,238,242,252']
 2024-03-22 -> ['207(again!!!),208,211(again),212']
 2024-03-21 -> ['152,153(again),190,191,198,200,206(again)', '39,48(again),49,53,54']
 2024-03-20 -> ['139(again),141,143(again)', '20,21,23,33(again)']
 2024-03-19 -> ['121,124(again),125,128,133(again)', '1,3,5,4,19']
-2024-03-18 -> ['213,217,226,230,235,238,242', '100,102,104,105(again)']
+2024-03-18 -> ['213,217,226,230,235,238,242,252', '100,102,104,105(again)']
 2024-03-17 -> ['207(again!!!),208,211(again),212', '73,76,79(again),91,25']
 2024-03-16 -> ['152,153(again),190,191,198,200,206(again)', '55(again),56,62,70']
-2024-03-15 -> ['213,217,226,230,235,238,242', '139(again),141,143(again)']
+2024-03-15 -> ['213,217,226,230,235,238,242,252', '139(again),141,143(again)']
 2024-03-14 -> ['207(again!!!),208,211(again),212', '121,124(again),125,128,133(again)']
-2024-03-13 -> ['213,217,226,230,235,238,242', '152,153(again),190,191,198,200,206(again)', '100,102,104,105(again)', '39,48(again),49,53,54']
-2024-03-12 -> ['213,217,226,230,235,238,242', '207(again!!!),208,211(again),212', '139(again),141,143(again)', '73,76,79(again),91,25', '20,21,23,33(again)']
-2024-03-11 -> ['213,217,226,230,235,238,242', '207(again!!!),208,211(again),212', '152,153(again),190,191,198,200,206(again)', '121,124(again),125,128,133(again)', '55(again),56,62,70', '1,3,5,4,19']
+2024-03-13 -> ['213,217,226,230,235,238,242,252', '152,153(again),190,191,198,200,206(again)', '100,102,104,105(again)', '39,48(again),49,53,54']
+2024-03-12 -> ['213,217,226,230,235,238,242,252', '207(again!!!),208,211(again),212', '139(again),141,143(again)', '73,76,79(again),91,25', '20,21,23,33(again)']
+2024-03-11 -> ['213,217,226,230,235,238,242,252', '207(again!!!),208,211(again),212', '152,153(again),190,191,198,200,206(again)', '121,124(again),125,128,133(again)', '55(again),56,62,70', '1,3,5,4,19']
 2024-03-10 -> ['207(again!!!),208,211(again),212', '152,153(again),190,191,198,200,206(again)', '139(again),141,143(again)', '100,102,104,105(again)']
 2024-03-09 -> ['152,153(again),190,191,198,200,206(again)', '139(again),141,143(again)', '121,124(again),125,128,133(again)', '73,76,79(again),91,25']
 2024-03-08 -> ['139(again),141,143(again)', '121,124(again),125,128,133(again)', '100,102,104,105(again)', '55(again),56,62,70', '39,48(again),49,53,54']
diff --git a/leetcode_java/src/main/java/LeetCodeJava/Sort/MeetingRooms.java b/leetcode_java/src/main/java/LeetCodeJava/Sort/MeetingRooms.java
index 0763f9d2..061c5dee 100644
--- a/leetcode_java/src/main/java/LeetCodeJava/Sort/MeetingRooms.java
+++ b/leetcode_java/src/main/java/LeetCodeJava/Sort/MeetingRooms.java
@@ -6,7 +6,24 @@
 
 public class MeetingRooms {
 
+    // V0
+    // IDEA : SORT
+    // https://github.com/yennanliu/CS_basics/blob/master/leetcode_python/Sort/meeting-rooms.py
     public boolean canAttendMeetings(int[][] intervals) {
+        // SORT ON 1st element (idx = 0)
+        Arrays.sort(intervals, (a, b) -> Integer.compare(a[0], b[0]));
+        // NOTE !!! start from idx=1
+        for (int i = 1; i < intervals.length; i++) {
+            if (intervals[i-1][1] > intervals[i][0]) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    // V1
+    // IDEA : SORT
+    public boolean canAttendMeetings_(int[][] intervals) {
 
         // sort
         //Arrays.sort(intervals, Comparator.comparingInt((x, y) -> x[0] - y[0]).reversed());
@@ -38,11 +55,11 @@ public boolean canAttendMeetings(int[][] intervals) {
         return true;
     }
 
-    // V1
+    // V2
     // IDEA : BRUTE FORCE
     // https://leetcode.com/problems/meeting-rooms/editorial/
 
-    // V1
+    // V3
     // IDEA : SORTING
     // https://leetcode.com/problems/meeting-rooms/editorial/
     public boolean canAttendMeetings_2(int[][] intervals) {
diff --git a/leetcode_java/src/main/java/LeetCodeJava/String/ValidAnagram.java b/leetcode_java/src/main/java/LeetCodeJava/String/ValidAnagram.java
index 149c80ba..52e55fd3 100644
--- a/leetcode_java/src/main/java/LeetCodeJava/String/ValidAnagram.java
+++ b/leetcode_java/src/main/java/LeetCodeJava/String/ValidAnagram.java
@@ -78,5 +78,5 @@ public boolean isAnagram_2(String s, String t) {
 
         return true;
     }
-    
+
 }